Merge pull request 'Add sub-national regional dataset + generator (v0.11.0)' (#25) from feat/sub-national-regions into master

Fixes #16

AGENTS.md

@@ -72,7 +72,7 @@ history/
     │   └── utils.ts        # cn()
     └── components/
         ├── PresetPicker.tsx / NationSelect.tsx   # home + nation pick screens
-        ├── WorldMap.tsx     # MapLibre basemap + choropleth + click popup + player highlight
+        ├── WorldMap.tsx     # MapLibre basemap + choropleth + click→dossier + hover tooltip + player highlight
         ├── NationPanel.tsx  # a nation's stats/territory/diplomacy dossier
         ├── ActionPanel.tsx  # tabs: Action / Diplomacy / Advisor + pending-queue list (per-item trash button + confirm dialog) + "Jump forward"
         ├── EventFeed.tsx    # scrolling event log (newest first)
@@ -140,6 +140,17 @@ history/
   (model down) surfaces as an HTTP 502 to the client (shown as a toast).
 - **Stable per-nation colors.** `shared.nationColor(id)` hashes a nation id → hue, shared by the
   server's `RegionMap` and any client coloring so the choropleth always agrees.
+- **Map click → dossier target (owner resolved from the RegionMap).** Clicking a map region does
+  NOT open a popup — it switches the dossier to that region's owning nation
+  (`setViewingId(ownerId)` in `GameScreen`); the manual "Inspect" selector and a map click both set
+  the same target and stay in sync. The owning nation is resolved from the authoritative `RegionMap`
+  by the feature's stable ISO_A3 code, which `applyRegions` stamps into `properties.regionId`
+  (properties survive into the rendered features) and the shared `regionOwner()` helper looks up.
+  It must **never** be read from the feature's top-level `id`: MapLibre repacks a GeoJSON source's
+  `id` into a numeric index when it stores the source, so at click/hover time `feature.id` is a
+  number, never the ISO_A3 (that repacking was the "no owner" bug, #6). Unowned regions (no
+  `RegionMap` entry) leave the current dossier target unchanged — never a broken dossier. The
+  hover path (a non-closeable tooltip with owner + key stats) uses the same resolution.
 - **Deterministic stub.** `server/stub.ts` answers the model contract deterministically per
   queued round item: each `action` item → one military/success event, each `diplomacy` item → one
   diplomatic/partial event, an empty round → one political "The world moves on" event. The player

CHANGELOG.md

@@ -2,6 +2,34 @@
 
 All notable changes to **History** are listed here, newest first.
 
+## v0.11.0 — 2026-10-12 00:31
+- **Sub-national region dataset + generator (#16, foundation only — no app behavior change).** A new dependency-free `scripts/generate-regions.mjs` (run via `npm run generate:regions`) splits each of the 177 countries in `public/countries.geo.json` into adaptive ~100–200 km sub-national regions on a regular lat/lon grid clipped to the country (Sutherland–Hodgman), and writes the committed `public/regions.geo.json` (**2,597 regions**, ~755 KB). Each region is id'd `<ISO_A3>-<nn>` (nn = 1..k in row-major order, capped at 36 per country) with `properties = { name, parent }`, so downstream work can map any region back to its parent nation. Antimeridian countries are handled three ways: small island groups (Fiji) stay a single whole-country region; large ones (Russia) are tiled in shifted [0,360) longitude space with output rings split at ±180°; and the full-360° Antarctic wrap ring becomes two hemispheric wedges. The output is fully deterministic — the same input yields a byte-identical file (verified by sha256).
+- **Validation test** — new self-contained `scripts/regions.test.ts` (picked up by `npm test`) reads the two GeoJSON files once each and asserts: the file is a well-formed FeatureCollection; every region is a valid feature whose id matches `^[A-Z]{3}-\d+$` and whose `parent` is a real country id; every country has 1–36 regions (≥2 for any country larger than 50,000 km²); every region has a sane area (≥ 200 km², with a microstate exemption, and < 5,000,000 km²); and each country's regions sum to 45–108% of its own area (the measured range is ~[64%, 105%] — Antarctica's wedges under-fill, Norway's high-latitude fjord coast over-fills by 0.1%). No change to the running app, the LLM contract, or the map — this is purely the dataset + tooling that later PRs for #16 build on.
+- Fixes #16.
+
+## v0.10.0 — 2026-10-11 21:25
+- **Fix world map style (#2)** — made the choropleth fill fully opaque (`fill-opacity` 0.85 → 1.0) and darkened the Natural Earth terrain raster (`raster-opacity` 0.5 → 0.15), so the raster's flat water tint and fine 1:10m coastline no longer bleed through countries and compete with the borders.
+- **Strengthened country border lines** — border width 0.7 → 1.25, and the per-region stroke alphas raised (owned 0.10 → 0.30, unowned 0.06 → 0.14) so the vector borders read clearly as the dominant edge, with owned regions still more prominent than unowned ones.
+- Fixes #2.
+
+## v0.9.0 — 2026-10-11 20:57
+- **Reduced turn latency (prompt-level):** capped `recentEvents` in the turn prompt from the last 10 to the last 5 events, and added a HARD CONSTRAINT asking the reasoning model to keep its internal analysis brief before emitting the JSON. This shortens the chain-of-thought (the 170–223s turn driver) and lowers the risk of exhausting the 4000-token output budget before the answer (the original 502 failure mode). Reasoning stays enabled (`reasoning_effort: low`); the deterministic stub, the `TurnResult` contract, `max_tokens`, and `reasoning_effort` are all unchanged.
+
+## v0.8.0 — 2026-10-11 20:29
+
+- **Remove a saved game (#20)** — every saved game now has a delete control: a trash button on its card in the home screen's "Saved games" section opens a confirmation dialog ("Delete this game?" showing the scenario/turn/date) with Cancel and a destructive Delete. The new `DELETE /api/games/:id` route removes the game's row from SQLite and returns `{ deleted: true }` (404 if the id is unknown).
+- **Redirect on a missing/deleted game (#20)** — loading a non-existent game id no longer leaves you stranded. A deep link to a missing game already fell back to home, and now a game that disappears *while its tab is open* (deleted from another tab or the same session) is pushed home too: the server broadcasts an SSE `error` event on delete, and the client's `useSse` gains an `onError` handler that returns the tab to the home screen (matching the existing "game not found" connect behavior).
+- `PresetPicker` gained an `onDelete` prop, a per-card `data-game-id` attribute, the delete button, and the confirm dialog; `api.deleteGame(id)`, `Db.delete(id)`, and the shared `DeleteGameResponse` type were added to support it.
+- **Unit + e2e tests** — new `Db.delete` test (removes by id; reports absence for unknown / already-gone ids) and two e2e specs: (a) deleting a saved game from the home screen (open → cancel leaves it; confirm removes the card, the response is `{deleted:true}`, and a follow-up `GET` is 404), and (b) deleting an open game (the live tab is pushed home via the SSE error, and a fresh deep-link to the deleted id lands on home).
+
+## v0.7.0 — 2026-10-11 19:17
+
+- Clicking a map region now switches the selected dossier to that region's owning nation instead of opening a popup (#7). The closeable click popup is gone; a hover tooltip (owner + key stats) is kept. The manual "Inspect" selector still works and stays in sync — both it and a map click drive the same dossier target.
+- Fixed: a clicked owned region no longer reports "no owner" (#6). Root cause: MapLibre repacks a GeoJSON source's top-level `id` (the ISO_A3 string) into a numeric index when it stores the source, so the feature a click/hover handler receives has a *number* for `id` — the old `regions[f.id]` lookup resolved to nothing, and the popup read "No owner" even for owned regions (the choropleth fill still worked because it is stamped from the original `id` before `setData`). Fix: `applyRegions` now stamps the stable ISO_A3 code into `properties.regionId` (and `ownerId`), which survives into the rendered features, and both the click and hover handlers resolve the owning nation from that code via the authoritative RegionMap — never from the repacked `feature.id`.
+- Unowned regions (no entry in the RegionMap) do not change the dossier when clicked — the current target is left in place (a deliberate, non-crashing choice rather than a special "unowned" dossier state).
+- New shared helper `regionOwner(regions, isoA3)` in `@shared/protocol` (the pure, single source of truth for "ISO_A3 → owner record").
+- **Unit tests** — new `regionOwner` tests (owned → owner record, unowned → undefined, empty/missing → undefined) plus a #6 regression guard that pins the exact MapLibre-repacked feature shape (numeric `id`, ISO_A3 in `properties.regionId`) and asserts resolution via `properties.regionId` works while the old `feature.id` path fails (44 tests, up from 39).
+
 ## v0.6.0 — 2026-10-11 18:27
 
 - Advisor fetches now show a "thinking" indicator (mirroring the turn's "Simulating…" hint) while the model responds, and the Ask-advisor button disables during the fetch; the top-bar status shows "Advisor thinking…" in the meantime. Fixes #15.

e2e/sim.spec.ts

@@ -560,3 +560,86 @@ test.describe('History — Advisor thinking indicator (#15)', () => {
     await expect(page.getByTestId('status-indicator')).toHaveText(/Idle/);
   });
 });
+
+/**
+ * Remove a saved game (#20): a saved game can be deleted from the home screen
+ * (with a confirmation dialog), and loading a non-existent / deleted game id
+ * (directly or via a stale open tab) returns the user to the home screen.
+ */
+test.describe('History — remove a saved game & redirect (#20)', () => {
+  test('deleting a saved game from the home screen removes it (with confirmation)', async ({
+    page,
+  }) => {
+    test.setTimeout(90000);
+    const id = await createUkGame(page);
+    await expect(page.getByTestId('world-map')).toBeVisible();
+
+    // Back to the home screen, where the just-created game appears in "Saved games".
+    await page.getByTestId('back-to-scenarios').click();
+    await expect(page.getByTestId('saved-games')).toBeVisible({ timeout: 15000 });
+    const card = page.locator(`[data-game-id="${id}"]`);
+    await expect(card).toBeVisible();
+
+    // Opening the confirm dialog…
+    await card.getByTestId('delete-game').click();
+    const dialog = page.getByTestId('delete-game-confirm-dialog');
+    await expect(dialog).toBeVisible();
+
+    // …and cancelling leaves the game in place.
+    await page.getByTestId('delete-game-cancel').click();
+    await expect(dialog).toHaveCount(0);
+    await expect(card).toBeVisible();
+
+    // Confirming the delete removes it: the DELETE succeeds, the card disappears,
+    // and a subsequent fetch reports the game gone.
+    await card.getByTestId('delete-game').click();
+    await expect(page.getByTestId('delete-game-confirm-dialog')).toBeVisible();
+    const [resp] = await Promise.all([
+      page.waitForResponse(
+        (r) =>
+          r.request().method() === 'DELETE' &&
+          new URL(r.url()).pathname === `/api/games/${id}`,
+      ),
+      page.getByTestId('delete-game-confirm').click(),
+    ]);
+    expect((await resp.json()) as { deleted: boolean }).toEqual({ deleted: true });
+    await expect(page.getByTestId('delete-game-confirm-dialog')).toHaveCount(0);
+    await expect(card).toHaveCount(0);
+
+    // The game is gone from the server too.
+    const status = await page.evaluate(async (gid) => {
+      const r = await fetch(`/api/games/${gid}`);
+      return r.status;
+    }, id);
+    expect(status).toBe(404);
+  });
+
+  test('deleting an open game sends the active tab home; a deep link lands on home', async ({
+    page,
+    context,
+  }) => {
+    test.setTimeout(90000);
+    const id = await createUkGame(page);
+    await expect(page.getByTestId('world-map')).toBeVisible();
+    await expect(page.getByTestId('turn-count')).toHaveText('1');
+    const origin = await page.evaluate(() => location.origin);
+
+    // Delete the game straight through the API while its tab is open. The server
+    // broadcasts an SSE `error` and the client's useSse onError handler returns
+    // this live tab to the home screen.
+    const delStatus = await page.evaluate(
+      async (gid) => (await fetch(`/api/games/${gid}`, { method: 'DELETE' })).status,
+      id,
+    );
+    expect(delStatus).toBe(200);
+    await expect(page.getByTestId('preset-card').first()).toBeVisible({ timeout: 20000 });
+    await waitHash(page, '#/');
+
+    // A brand-new page deep-linking to the now-deleted id also lands on home.
+    const page2 = await context.newPage();
+    await page2.goto(`${origin}/#/game/${id}`);
+    await expect(page2.getByTestId('preset-card').first()).toBeVisible({ timeout: 20000 });
+    await waitHash(page2, '#/');
+    await page2.close();
+  });
+});

eslint.config.js

@@ -30,6 +30,7 @@ export default tseslint.config(
       'vitest.config.ts',
       'playwright.config.ts',
       'scripts/**/*.mjs',
+      'scripts/**/*.ts',
     ],
     languageOptions: { globals: { ...globals.node, ...globals.es2022 } },
     rules: {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "history",
-  "version": "0.6.0",
+  "version": "0.11.0",
   "private": true,
   "type": "module",
   "description": "AI-driven alternate-history simulator — the LLM is the world engine (Pax Historia style).",
@@ -9,6 +9,7 @@
     "build": "vite build && tsup server/index.ts --format esm --target node22 --out-dir server/dist --external better-sqlite3",
     "start": "node server/dist/index.js",
     "test": "vitest run",
+    "generate:regions": "node scripts/generate-regions.mjs",
     "typecheck": "tsc --noEmit",
     "lint": "eslint .",
     "e2e": "playwright test"

scripts/generate-regions.mjs

@@ -0,0 +1,520 @@
+#!/usr/bin/env node
+/**
+ * scripts/generate-regions.mjs — dependency-free generator for `public/regions.geo.json`.
+ *
+ * Subdivides every country in `public/countries.geo.json` into sub-national
+ * regions sized ~100–200 km on a side (adaptive: a regular lat/lon grid
+ * clipped to the country, so vast/sparse countries — Siberia, Sahara,
+ * Antarctica — end up with bigger regions while Europe gets smaller ones).
+ * Each country gets a few to tens of regions (capped at 36); tiny countries
+ * (and tiny antimeridian islet groups) stay a single region.
+ *
+ * Model: a country's lat/lon bbox is tiled with a cols × rows grid of
+ * ~square-in-km cells. Each grid cell yields at most ONE region feature:
+ * every sub-polygon of the country is clipped against the cell with
+ * Sutherland–Hodgman (edges in order: left, bottom, right, top), clipped
+ * pieces smaller than 300 km² are dropped, and the kept pieces become the
+ * rings of that cell's region (a MultiPolygon when there is more than one).
+ * Region ids are `<ISO_A3>-<nn>`, nn = 1..k in row-major order (rows
+ * top→bottom by descending lat, left→right by ascending lon); names are
+ * `<Country> R<nn>`. Coordinates are rounded to 4 decimal places (≈11 m).
+ * Because a cell produces at most one region, the per-country count can
+ * never exceed the (capped) cell count ≤ 36, even for archipelagos.
+ *
+ * Area: local planar approximation, x = lon·111.32·cos(midLat), y = lat·
+ * 110.574 (km), shoelace per sub-polygon ring, summed in abs. Target region
+ * area T = 12,000 km² (≈110 km side); target count n = clamp(round(area /
+ * T), 1, 36). S = sqrt(bboxAreaKm2 / n); cols = max(1, round(wKm/S)),
+ * rows = max(1, round(hKm/S)); the grid is then reduced if cols·rows > 36.
+ *
+ * Antimeridian handling (three cases):
+ *  - Small antimeridian island groups (area ≤ 50,000 km² — Fiji, Kiribati,
+ *    Tuvalu, …): one region = the whole country (`<ISO_A3>-01`, plain name).
+ *  - Large antimeridian countries made of ordinary sub-polygons (Russia):
+ *    the sub-polygons are shifted into longitude space [0, 360) (lons < 0 →
+ *    +360) so the country sits in one contiguous band, tiled there, and
+ *    output rings that straddle ±180° are split at the antimeridian into a
+ *    MultiPolygon with each ring fully on one side — standard −180..180
+ *    GeoJSON that renders without cross-map lines.
+ *  - Full-360° "polar" wrap rings (Antarctica's main ring, whose only
+ *    longitude jump sits at the pole and which crosses the prime meridian
+ *    once): such a ring self-intersects in any single planar representation,
+ *    so it is replaced by two simple "wedge" rings — the eastern and western
+ *    hemispheric halves, each closed along the prime meridian, the pole
+ *    (lat −90), and the antimeridian. The wedges tile −180..180 space
+ *    without overlap and are tiled like any other ring (no shifting needed).
+ *
+ * Deterministic: same input → byte-identical output.
+ * Run: `npm run generate:regions`
+ */
+
+import { readFileSync, writeFileSync } from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const here = path.dirname(fileURLToPath(import.meta.url));
+const root = path.resolve(here, '..');
+
+// --- parameters ------------------------------------------------------------------
+const T = 12_000; // target region area, km² (≈110 km side)
+const MAX_REGIONS = 36; // per-country cap ("tens")
+const SLIVER_KM2 = 300; // drop clipped pieces smaller than this
+const BIG_KM2 = 50_000; // antimeridian countries at/above this are tiled, not 1 region
+const KM_LON = 111.32; // km per degree of longitude (at the equator)
+const KM_LAT = 110.574; // km per degree of latitude
+
+// --- geo helpers (same planar approximation as scripts/regions.test.ts) -----------
+const rad = (deg) => (deg * Math.PI) / 180;
+const r4 = (v) => Math.round(v * 1e4) / 1e4;
+
+function polygons(geom) {
+  return geom.type === 'Polygon' ? [geom.coordinates] : geom.coordinates;
+}
+
+function allCoords(geom) {
+  const out = [];
+  for (const poly of polygons(geom)) for (const ring of poly) for (const c of ring) out.push(c);
+  return out;
+}
+
+function meanLat(geom) {
+  const cs = allCoords(geom);
+  let s = 0;
+  for (const c of cs) s += c[1];
+  return cs.length ? s / cs.length : 0;
+}
+
+function bbox(rings) {
+  let minLon = Infinity,
+    maxLon = -Infinity,
+    minLat = Infinity,
+    maxLat = -Infinity;
+  for (const ring of rings)
+    for (const [lo, la] of ring) {
+      if (lo < minLon) minLon = lo;
+      if (lo > maxLon) maxLon = lo;
+      if (la < minLat) minLat = la;
+      if (la > maxLat) maxLat = la;
+    }
+  return { minLon, maxLon, minLat, maxLat };
+}
+
+/** |shoelace| of a (possibly open) ring in km², using one mid-latitude for x. */
+function ringAreaKm2(ring, midLat) {
+  const kx = KM_LON * Math.cos(rad(midLat));
+  let a = 0;
+  const n = ring.length;
+  for (let i = 0; i < n; i++) {
+    const [lon1, lat1] = ring[i];
+    const [lon2, lat2] = ring[(i + 1) % n];
+    a += lon1 * kx * (lat2 * KM_LAT) - lon2 * kx * (lat1 * KM_LAT);
+  }
+  return Math.abs(a / 2);
+}
+
+/** Remove consecutive duplicate points and a trailing closing point equal to the first. */
+function dedupeRing(ring) {
+  const out = [];
+  for (const p of ring) {
+    const last = out[out.length - 1];
+    if (!last || last[0] !== p[0] || last[1] !== p[1]) out.push(p);
+  }
+  if (
+    out.length > 1 &&
+    out[0][0] === out[out.length - 1][0] &&
+    out[0][1] === out[out.length - 1][1]
+  )
+    out.pop();
+  return out;
+}
+
+/** Close an open ring by appending a copy of the first point. */
+function closeRing(ring) {
+  return ring.length ? [...ring, [...ring[0]]] : ring;
+}
+
+/**
+ * The tiling/area subject rings of a feature, in standard −180..180 space:
+ * one open ring per sub-polygon (outer ring only — holes are ignored by
+ * design: Sutherland–Hodgman clips simple rings and any enclosed water is
+ * at most a lake, which the area-sanity tolerance in the test absorbs).
+ * A full-360° wrap ring is replaced by its two hemispheric wedges (see
+ * makeWedges); if that is not possible the ring is returned as-is (the
+ * caller may still shift it).
+ */
+function subjectRings(geom) {
+  const out = [];
+  for (const poly of polygons(geom)) {
+    const ring = dedupeRing(poly[0]);
+    if (hasAMJump(ring)) {
+      const wedges = makeWedges(ring);
+      if (wedges) out.push(...wedges);
+      else out.push(ring);
+    } else {
+      out.push(ring);
+    }
+  }
+  return out;
+}
+
+// --- Sutherland–Hodgman: clip an open subject ring against one half-plane --------
+function clipEdge(poly, inside, intersect) {
+  const out = [];
+  for (let i = 0; i < poly.length; i++) {
+    const a = poly[i];
+    const b = poly[(i + 1) % poly.length];
+    const aIn = inside(a);
+    const bIn = inside(b);
+    if (aIn && bIn) out.push(b);
+    else if (aIn && !bIn) out.push(intersect(a, b));
+    else if (!aIn && bIn) {
+      out.push(intersect(a, b));
+      out.push(b);
+    }
+  }
+  return out;
+}
+
+/**
+ * Clip an open subject ring against an axis-aligned (lon/lat) rectangle.
+ * Edges are processed in order: left, bottom, right, top. Returns the clipped
+ * open ring, or [] if empty.
+ */
+function clipRect(ring, [x0, y0, x1, y1]) {
+  let poly = clipEdge(
+    ring,
+    (p) => p[0] >= x0,
+    (a, b) => {
+      const t = (x0 - a[0]) / (b[0] - a[0]);
+      return [x0, a[1] + (b[1] - a[1]) * t];
+    },
+  );
+  if (!poly.length) return [];
+  poly = clipEdge(
+    poly,
+    (p) => p[1] >= y0,
+    (a, b) => {
+      const t = (y0 - a[1]) / (b[1] - a[1]);
+      return [a[0] + (b[0] - a[0]) * t, y0];
+    },
+  );
+  if (!poly.length) return [];
+  poly = clipEdge(
+    poly,
+    (p) => p[0] <= x1,
+    (a, b) => {
+      const t = (x1 - a[0]) / (b[0] - a[0]);
+      return [x1, a[1] + (b[1] - a[1]) * t];
+    },
+  );
+  if (!poly.length) return [];
+  poly = clipEdge(
+    poly,
+    (p) => p[1] <= y1,
+    (a, b) => {
+      const t = (y1 - a[1]) / (b[1] - a[1]);
+      return [a[0] + (b[0] - a[0]) * t, y1];
+    },
+  );
+  return poly;
+}
+
+// --- antimeridian handling ---------------------------------------------------------
+
+/** True if the ring has an edge with |Δlon| > 180 (an antimeridian jump). */
+function hasAMJump(ring) {
+  const n = ring.length;
+  for (let i = 0; i < n; i++)
+    if (Math.abs(ring[i][0] - ring[(i + 1) % n][0]) > 180) return true;
+  return false;
+}
+
+function crossesAntimeridian(geom) {
+  let minLon = Infinity,
+    maxLon = -Infinity;
+  for (const [lo] of allCoords(geom)) {
+    if (lo < minLon) minLon = lo;
+    if (lo > maxLon) maxLon = lo;
+  }
+  return maxLon > 0 && minLon < 0 && maxLon - minLon > 180;
+}
+
+/**
+ * Replace a full-360° wrap ring (one antimeridian jump, one prime-meridian
+ * crossing) by two simple hemispheric "wedge" rings, each closed along the
+ * prime meridian (x = 0), the pole (lat = −90), and the antimeridian
+ * (x = ±180). Both wedges lie in standard −180..180 space, are disjoint, and
+ * together cover exactly the original ring's enclosed region. Returns
+ * [westRing, eastRing] (open rings), or null if the ring has an unexpected
+ * shape (no wrap handling possible).
+ */
+function makeWedges(ring) {
+  const n = ring.length;
+  if (n < 3) return null;
+  const jAM = [];
+  const jPM = [];
+  for (let i = 0; i < n; i++) {
+    const a = ring[i];
+    const b = ring[(i + 1) % n];
+    if (Math.abs(a[0] - b[0]) > 180) jAM.push(i);
+    else if (a[0] !== 0 && b[0] !== 0 && (a[0] < 0) !== (b[0] < 0)) jPM.push(i);
+  }
+  if (jAM.length !== 1 || jPM.length !== 1) return null;
+
+  const iAM = jAM[0];
+  const a = ring[iAM]; // the +180 end of the jump
+  const b = ring[(iAM + 1) % n]; // the −180 end of the jump
+  if (Math.abs(a[0] - 180) > 1e-6 || Math.abs(b[0] + 180) > 1e-6) return null;
+
+  const iPM = jPM[0];
+  const p = ring[iPM];
+  const q = ring[(iPM + 1) % n];
+  const t = (0 - p[0]) / (q[0] - p[0]);
+  const P = [0, p[1] + (q[1] - p[1]) * t]; // the exact prime-meridian crossing
+
+  // Chain from b (−180) forward to P: everything in between must have lon ≤ 0.
+  const west = [];
+  for (let i = (iAM + 1) % n; ; i = (i + 1) % n) {
+    const pt = ring[i];
+    if (pt[0] > 0) return null;
+    west.push(pt);
+    if (i === iPM) break;
+  }
+  west.push(P);
+  // Chain from P forward to a (+180): everything in between must have lon ≥ 0.
+  const east = [P];
+  for (let i = (iPM + 1) % n; ; i = (i + 1) % n) {
+    const pt = ring[i];
+    if (pt[0] < 0) return null;
+    east.push(pt);
+    if (i === iAM) break;
+  }
+
+  const pole = (x) => [x, -90];
+  // West wedge: P → pole along x=0 → pole along the pole → up the −180 side →
+  // the western coast back to P. East wedge: the mirror image on x ≥ 0.
+  const westWedge = dedupeRing([P, pole(0), pole(-180), b, ...west.slice(1)]);
+  // The east chain q→…→a runs in *increasing* lon, so to trace the coast back
+  // from a to q (keeping the wedge simple) we walk it in reverse.
+  const eastWedge = dedupeRing([P, pole(0), pole(180), a, ...east.slice(1, -1).reverse()]);
+  if (westWedge.length < 3 || eastWedge.length < 3) return null;
+  return [westWedge, eastWedge];
+}
+
+/**
+ * Split an open ring (in shifted [0,360) space) at the antimeridian (x = 180).
+ *
+ * Instead of walking the ring between crossings (which breaks on jagged
+ * coastlines that cross the antimeridian many times), clip the ring against
+ * the two half-planes x ≤ 180 and x ≥ 180 with Sutherland–Hodgman. Each piece
+ * is a proper closed-on-the-split-line polygon, the two pieces share only the
+ * x = 180 boundary, and the split is area-preserving (the boundary has zero
+ * area). Both pieces are returned in shifted space; the caller remaps any
+ * x > 180 piece back into −180..0.
+ */
+function splitAtAM(ring) {
+  if (ring.length < 3) return [];
+  const cross = (a, b) => {
+    const t = (180 - a[0]) / (b[0] - a[0]);
+    return [180, a[1] + (b[1] - a[1]) * t];
+  };
+  const left = clipEdge(ring, (p) => p[0] <= 180, cross); // x in [0, 180]
+  // Right piece: x in [180, 360). Remap EVERY vertex by -360 (including the
+  // shared x = 180 boundary vertex → -180) so the piece sits fully on the west
+  // side of the antimeridian with no ±180 jump inside the ring.
+  const right = clipEdge(ring, (p) => p[0] >= 180, cross).map(
+    ([lo, la]) => [lo - 360, la],
+  );
+  const pieces = [];
+  if (left.length >= 3) pieces.push(left);
+  if (right.length >= 3) pieces.push(right);
+  return pieces;
+}
+
+// --- feature processing ------------------------------------------------------------
+
+function makeFeature(id, name, parent, rings) {
+  // Each ring is an INDEPENDENT piece (a separate island or a separate clipped
+  // cell fragment), never a hole. GeoJSON: a MultiPolygon is an array of
+  // polygons, each polygon an array of rings — so wrap every ring in its own
+  // (single-ring) polygon. ([rings] would instead make ring 0 the outer and
+  // every other ring a hole, swallowing e.g. Fiji's other islands.)
+  return {
+    type: 'Feature',
+    id,
+    properties: { name, parent },
+    geometry:
+      rings.length === 1
+        ? { type: 'Polygon', coordinates: [rings[0]] }
+        : { type: 'MultiPolygon', coordinates: rings.map((r) => [r]) },
+  };
+}
+
+/**
+ * Whole-country single region (no tiling, no sliver drops): all sub-polygons
+ * in one feature, coordinates rounded. Used for tiny countries (n = 1) and
+ * small antimeridian-crossing island groups.
+ */
+function wholeCountryFeature(feature) {
+  const id = feature.id;
+  const name = feature.properties.name;
+  const rings = polygons(feature.geometry).map((poly) =>
+    closeRing(dedupeRing(poly[0]).map(([lo, la]) => [r4(lo), r4(la)])),
+  );
+  return [makeFeature(`${id}-01`, name, id, rings)];
+}
+
+/**
+ * Tile the country's bbox with a cols × rows grid; each non-empty cell yields
+ * one region feature (its kept clipped pieces as a Polygon/MultiPolygon).
+ * `shifted` = true for large non-wrapping antimeridian countries (Russia):
+ * work in [0, 360) longitude space, then split output rings at ±180°.
+ */
+function tileFeature(feature, rings, shifted) {
+  const id = feature.id;
+  const name = feature.properties.name;
+  const midLat = meanLat(feature.geometry);
+  const area = rings.reduce((s, r) => s + ringAreaKm2(r, midLat), 0);
+
+  const n = Math.min(MAX_REGIONS, Math.max(1, Math.round(area / T)));
+  if (n === 1) return wholeCountryFeature(feature);
+
+  const shiftLon = (lo) => (shifted && lo < 0 ? lo + 360 : lo);
+  const work = rings.map((r) => r.map(([lo, la]) => [shiftLon(lo), la]));
+  const bb = bbox(work);
+
+  const kx = KM_LON * Math.cos(rad(midLat));
+  const wKm = (bb.maxLon - bb.minLon) * kx;
+  const hKm = (bb.maxLat - bb.minLat) * KM_LAT;
+  const S = Math.sqrt((wKm * hKm) / n);
+  let cols = Math.max(1, Math.round(wKm / S));
+  let rows = Math.max(1, Math.round(hKm / S));
+  while (cols * rows > MAX_REGIONS) {
+    if (cols >= rows) cols = Math.max(1, Math.floor(MAX_REGIONS / rows));
+    else rows = Math.max(1, Math.floor(MAX_REGIONS / cols));
+  }
+
+  const dLon = (bb.maxLon - bb.minLon) / cols;
+  const dLat = (bb.maxLat - bb.minLat) / rows;
+
+  const out = [];
+  let nn = 0;
+  for (let r = 0; r < rows; r++) {
+    const yTop = bb.maxLat - r * dLat;
+    const yBot = bb.maxLat - (r + 1) * dLat;
+    for (let c = 0; c < cols; c++) {
+      const xLeft = bb.minLon + c * dLon;
+      const xRight = bb.minLon + (c + 1) * dLon;
+      // One region per cell: clip every sub-ring, keep the pieces that clear
+      // the sliver threshold, and merge them into a single feature.
+      const cellPieces = [];
+      for (const ring of work) {
+        const clipped = clipRect(ring, [xLeft, yBot, xRight, yTop]);
+        if (clipped.length < 3) continue;
+        if (ringAreaKm2(clipped, midLat) < SLIVER_KM2) continue;
+        // splitAtAM returns pieces already in standard −180..180 space (the
+        // x > 180 half remapped), so no further per-vertex remap is needed.
+        const pieces = shifted
+          ? splitAtAM(dedupeRing(clipped)).map((pc) => dedupeRing(pc))
+          : [dedupeRing(clipped)];
+        for (const pc of pieces)
+          if (pc.length >= 3) cellPieces.push(pc.map(([lo, la]) => [r4(lo), r4(la)]));
+      }
+      if (!cellPieces.length) continue;
+      const closed = cellPieces
+        .map(dedupeRing)
+        .filter((pc) => pc.length >= 3)
+        .map(closeRing);
+      if (!closed.length) continue;
+      nn += 1;
+      const nnStr = String(nn).padStart(2, '0');
+      out.push(makeFeature(`${id}-${nnStr}`, `${name} R${nnStr}`, id, closed));
+    }
+  }
+  return out;
+}
+
+function processFeature(feature) {
+  const geom = feature.geometry;
+  const am = crossesAntimeridian(geom);
+  if (am && featureAreaKm2(feature) <= BIG_KM2) {
+    // Small antimeridian island group (Fiji, Kiribati, Tuvalu, …): one region.
+    return wholeCountryFeature(feature);
+  }
+  // Wrapping rings (Antarctica) are already in standard space as wedges — no
+  // shifting; non-wrapping antimeridian countries (Russia) are shifted.
+  const rings = subjectRings(geom);
+  const hasWrap = polygons(geom).some((p) => hasAMJump(dedupeRing(p[0])));
+  const shifted = am && !hasWrap;
+  return tileFeature(feature, rings, shifted);
+}
+
+/** Total planar area of a feature's tiling rings (same convention as tileFeature). */
+function featureAreaKm2(feature) {
+  const midLat = meanLat(feature.geometry);
+  return subjectRings(feature.geometry).reduce((s, r) => s + ringAreaKm2(r, midLat), 0);
+}
+
+// --- main ---------------------------------------------------------------------------
+
+function main() {
+  const src = readFileSync(path.join(root, 'public', 'countries.geo.json'), 'utf8');
+  const countries = JSON.parse(src);
+
+  const features = [];
+  const amSingletons = [];
+  const amTiled = [];
+  for (const f of countries.features) {
+    if (crossesAntimeridian(f.geometry)) {
+      (featureAreaKm2(f) <= BIG_KM2 ? amSingletons : amTiled).push(f.id);
+    }
+    features.push(...processFeature(f));
+  }
+  // Sorted by (parent, nn) — the processing order already guarantees this, but
+  // sort explicitly so the contract holds regardless of traversal changes.
+  features.sort((a, b) => {
+    if (a.properties.parent !== b.properties.parent)
+      return a.properties.parent < b.properties.parent ? -1 : 1;
+    return a.id.localeCompare(b.id, 'en', { numeric: true });
+  });
+
+  const out = { type: 'FeatureCollection', features };
+  const json = JSON.stringify(out);
+  writeFileSync(path.join(root, 'public', 'regions.geo.json'), json + '\n');
+
+  // --- summary ----------------------------------------------------------------------
+  const counts = new Map();
+  for (const f of features)
+    counts.set(f.properties.parent, (counts.get(f.properties.parent) ?? 0) + 1);
+  const sortedCounts = [...counts.values()].sort((a, b) => a - b);
+  const median =
+    sortedCounts.length % 2
+      ? sortedCounts[Math.floor(sortedCounts.length / 2)]
+      : (sortedCounts[sortedCounts.length / 2 - 1] + sortedCounts[sortedCounts.length / 2]) / 2;
+
+  // Max region area (planar approximation, same mid-latitude convention as the
+  // tiling: the parent country's mean latitude).
+  const midLatByParent = new Map(countries.features.map((f) => [f.id, meanLat(f.geometry)]));
+  let maxArea = 0;
+  let maxId = '';
+  for (const f of features) {
+    const midLat = midLatByParent.get(f.properties.parent);
+    let a = 0;
+    for (const poly of polygons(f.geometry)) for (const ring of poly) a += ringAreaKm2(ring, midLat);
+    if (a > maxArea) {
+      maxArea = a;
+      maxId = f.id;
+    }
+  }
+
+  console.log(`regions: ${features.length} total (${countries.features.length} countries)`);
+  console.log(`file:    public/regions.geo.json — ${(Buffer.byteLength(json + '\n') / 1024).toFixed(1)} KB`);
+  console.log(
+    `count:   min ${sortedCounts[0]} / median ${median} / max ${sortedCounts[sortedCounts.length - 1]} per country`,
+  );
+  console.log(`max region: ${maxId} ≈ ${Math.round(maxArea).toLocaleString('en-US')} km²`);
+  if (amSingletons.length) console.log(`AM → 1 region: ${amSingletons.join(', ')}`);
+  if (amTiled.length) console.log(`AM → tiled (shifted/wedges): ${amTiled.join(', ')}`);
+}
+
+main();

scripts/regions.test.ts

@@ -0,0 +1,191 @@
+/**
+ * scripts/regions.test.ts — validation for the committed `public/regions.geo.json`.
+ *
+ * Self-contained (no import of the generator): it re-implements the generator's
+ * exact planar area model so the assertions measure the same quantity the
+ * generator used to size and clip regions:
+ *
+ *   x = lon · 111.32 · cos(midLat),  y = lat · 110.574  (km)
+ *
+ * with a shoelace per outer ring, where each ring is measured at its own mean
+ * latitude. Outer rings only — the generator never emits holes (every ring is an
+ * independent piece: a separate island or a separate clipped cell fragment).
+ *
+ * It reads each file exactly once and runs in O(total vertices).
+ */
+import { readFileSync } from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { describe, expect, it } from 'vitest';
+
+const here = path.dirname(fileURLToPath(import.meta.url));
+const root = path.resolve(here, '..');
+
+// --- area model (must match scripts/generate-regions.mjs exactly) -----------------
+const KM_LON = 111.32;
+const KM_LAT = 110.574;
+const rad = (deg: number) => (deg * Math.PI) / 180;
+
+type Ring = [number, number][];
+type Geometry =
+  | { type: 'Polygon'; coordinates: Ring[] }
+  | { type: 'MultiPolygon'; coordinates: Ring[][] };
+
+function ringAreaKm2(ring: Ring, midLat: number): number {
+  const kx = KM_LON * Math.cos(rad(midLat));
+  let a = 0;
+  const n = ring.length;
+  for (let i = 0; i < n; i++) {
+    const [lon1, lat1] = ring[i];
+    const [lon2, lat2] = ring[(i + 1) % n];
+    a += lon1 * kx * (lat2 * KM_LAT) - lon2 * kx * (lat1 * KM_LAT);
+  }
+  return Math.abs(a / 2);
+}
+
+function outerRings(geom: Geometry): Ring[] {
+  if (geom.type === 'Polygon') return [geom.coordinates[0]];
+  if (geom.type === 'MultiPolygon') return geom.coordinates.map((p) => p[0]);
+  return [];
+}
+
+/** Sum of a feature's outer-ring areas, each ring at its own mean latitude. */
+function featureAreaKm2(geom: Geometry): number {
+  let total = 0;
+  for (const ring of outerRings(geom)) {
+    let lat = 0;
+    for (const [, la] of ring) lat += la;
+    total += ringAreaKm2(ring, ring.length ? lat / ring.length : 0);
+  }
+  return total;
+}
+// -------------------------------------------------------------------------------
+
+interface RegionFeature {
+  type: 'Feature';
+  id: string;
+  properties: { name: string; parent: string };
+  geometry: Geometry;
+}
+interface CountryFeature {
+  type: 'Feature';
+  id: string;
+  properties: { name: string };
+  geometry: Geometry;
+}
+interface FeatureCollection<T> {
+  type: 'FeatureCollection';
+  features: T[];
+}
+
+// Read each file exactly once.
+const regions = JSON.parse(
+  readFileSync(path.join(root, 'public', 'regions.geo.json'), 'utf8'),
+) as FeatureCollection<RegionFeature>;
+const countries = JSON.parse(
+  readFileSync(path.join(root, 'public', 'countries.geo.json'), 'utf8'),
+) as FeatureCollection<CountryFeature>;
+
+// Precompute areas once (O(total vertices)).
+const countryArea = new Map<string, number>();
+for (const c of countries.features) countryArea.set(c.id, featureAreaKm2(c.geometry));
+const regionArea = new Map<string, number>();
+for (const f of regions.features) regionArea.set(f.id, featureAreaKm2(f.geometry));
+const regionSumByParent = new Map<string, number>();
+for (const f of regions.features) {
+  regionSumByParent.set(
+    f.properties.parent,
+    (regionSumByParent.get(f.properties.parent) ?? 0) + (regionArea.get(f.id) ?? 0),
+  );
+}
+const countByParent = new Map<string, number>();
+for (const f of regions.features) {
+  countByParent.set(f.properties.parent, (countByParent.get(f.properties.parent) ?? 0) + 1);
+}
+
+describe('regions.geo.json', () => {
+  it('is a valid GeoJSON FeatureCollection', () => {
+    expect(regions.type).toBe('FeatureCollection');
+    expect(Array.isArray(regions.features)).toBe(true);
+    expect(regions.features.length).toBeGreaterThan(0);
+  });
+
+  it('every region is a well-formed feature with a valid id and a valid parent country', () => {
+    const countryIds = new Set(countries.features.map((c) => c.id));
+    const idRe = /^[A-Z]{3}-\d+$/;
+    for (const f of regions.features) {
+      expect(f.type, `${f.id ?? '?'}: not a Feature`).toBe('Feature');
+      expect(idRe.test(f.id), `${f.id ?? '?'}: bad id`).toBe(true);
+      expect(typeof f.properties?.name, `${f.id}: missing name`).toBe('string');
+      expect(f.properties.name.length, `${f.id}: empty name`).toBeGreaterThan(0);
+      expect(typeof f.properties.parent, `${f.id}: missing parent`).toBe('string');
+      expect(countryIds.has(f.properties.parent), `${f.id}: unknown parent ${f.properties.parent}`).toBe(true);
+      expect(f.properties.parent, `${f.id}: parent != ISO_A3 prefix`).toBe(f.id.slice(0, 3));
+      const g = f.geometry;
+      expect(
+        !!g && (g.type === 'Polygon' || g.type === 'MultiPolygon'),
+        `${f.id}: bad geometry type ${g?.type}`,
+      ).toBe(true);
+    }
+  });
+
+  it('gives every country 1..36 regions, and >=2 for any country > 50,000 km²', () => {
+    for (const c of countries.features) {
+      const n = countByParent.get(c.id) ?? 0;
+      expect(n, `country ${c.id} has no regions`).toBeGreaterThanOrEqual(1);
+      expect(n, `country ${c.id} has ${n} regions (> 36)`).toBeLessThanOrEqual(36);
+      if ((countryArea.get(c.id) ?? 0) > 50_000) {
+        expect(n, `large country ${c.id} should have >= 2 regions`).toBeGreaterThanOrEqual(2);
+      }
+    }
+  });
+
+  it('every region has a sane area: >= 200 km² (microstates exempt) and < 5,000,000 km²', () => {
+    let maxArea = 0;
+    let maxId = '';
+    for (const f of regions.features) {
+      const a = regionArea.get(f.id) ?? 0;
+      const parentArea = countryArea.get(f.properties.parent) ?? 0;
+      // A whole-country singleton of a sub-200 km² microstate is exempt.
+      expect(a >= 200 || parentArea < 200, `${f.id}: area ${a.toFixed(1)} km² is too small`).toBe(true);
+      expect(a < 5_000_000, `${f.id}: area ${Math.round(a).toLocaleString('en-US')} km² is absurdly large`).toBe(true);
+      if (a > maxArea) {
+        maxArea = a;
+        maxId = f.id;
+      }
+    }
+    console.log(`\n  max region area: ${maxId} ≈ ${Math.round(maxArea).toLocaleString('en-US')} km²`);
+  });
+
+  it('covers each country to within [45%, 108%] of its own area', () => {
+    // The band is a planar-approximation sanity check. The measured range is
+    // ~[64%, 105%]: Antarctica's hemispheric wedges under-fill to ~64%, and
+    // Norway's fjord-heavy, high-latitude coast over-fills to ~105.1% under the
+    // single-mid-latitude approximation. [45%, 108%] brackets that with margin
+    // while still catching a genuinely missing or doubled-up region.
+    let minRatio = Infinity;
+    let maxRatio = -Infinity;
+    let minId = '';
+    let maxId = '';
+    for (const c of countries.features) {
+      const ca = countryArea.get(c.id) ?? 0;
+      if (ca <= 0) continue;
+      const ratio = (regionSumByParent.get(c.id) ?? 0) / ca;
+      if (ratio < minRatio) {
+        minRatio = ratio;
+        minId = c.id;
+      }
+      if (ratio > maxRatio) {
+        maxRatio = ratio;
+        maxId = c.id;
+      }
+      expect(
+        ratio >= 0.45 && ratio <= 1.08,
+        `${c.id}: coverage ${(100 * ratio).toFixed(1)}% is outside [45%, 108%]`,
+      ).toBe(true);
+    }
+    console.log(
+      `\n  coverage range: min ${minId} ${(100 * minRatio).toFixed(1)}% / max ${maxId} ${(100 * maxRatio).toFixed(1)}% (band 45–108%)`,
+    );
+  });
+});

server/db.test.ts

@@ -72,4 +72,19 @@ describe('openDb', () => {
     expect(db.load('missing')).toBeNull();
     db.close();
   });
+
+  it('delete removes a game by id and reports absence otherwise', () => {
+    const db = openDb(':memory:');
+    db.save(makeState('a'));
+    db.save(makeState('b'));
+
+    expect(db.delete('nope')).toBe(false); // unknown id
+    expect(db.delete('a')).toBe(true); // removes a
+    expect(db.load('a')).toBeNull();
+    expect(db.load('b')?.id).toBe('b');
+    expect([...db.listIds()].sort()).toEqual(['b']);
+
+    expect(db.delete('a')).toBe(false); // already gone
+    db.close();
+  });
 });

server/db.ts

@@ -8,6 +8,7 @@ export interface Db {
   save(state: GameState): void;
   load(id: string): GameState | null;
   listIds(): string[];
+  delete(id: string): boolean;
   close(): void;
 }
 
@@ -29,6 +30,7 @@ export function openDb(filePath: string): Db {
   );
   const byId = db.prepare('SELECT data FROM games WHERE id = ?');
   const all = db.prepare('SELECT id FROM games ORDER BY updated_at DESC');
+  const del = db.prepare('DELETE FROM games WHERE id = ?');
   return {
     save(state) {
       upsert.run(state.id, JSON.stringify(state), new Date().toISOString());
@@ -45,6 +47,9 @@ export function openDb(filePath: string): Db {
     listIds() {
       return (all.all() as { id: string }[]).map((r) => r.id);
     },
+    delete(id) {
+      return del.run(id).changes > 0;
+    },
     close() {
       db.close();
     },

server/engine.test.ts

@@ -1,10 +1,11 @@
 import { describe, expect, it } from 'vitest';
 import type { GameState, Preset, RoundItem } from '../shared/types';
-import type { TurnResult } from '../shared/protocol';
+import { makeEvent, type TurnResult } from '../shared/protocol';
 import type { LlmClient } from './llm';
 import { makeStubLlmClient } from './stub';
 import {
   applyTurnResult,
+  buildSystemPrompt,
   buildUserPrompt,
   isMeaningful,
   parseTurnResult,
@@ -279,6 +280,44 @@ describe('buildUserPrompt (batched round)', () => {
     expect(parsed.roundInstruction).toMatch(/no action/i);
     expect(parsed.roundInstruction).toMatch(/own momentum/i);
   });
+
+  it('caps recentEvents at the last 5 (in order) when the state has more than 5 events', () => {
+    const state = baseState();
+    const events = Array.from({ length: 8 }, (_, i) =>
+      makeEvent(
+        {
+          nation: 'uk',
+          type: 'political',
+          title: `Event ${i + 1}`,
+          text: `Narrative ${i + 1}`,
+          outcome: 'neutral',
+        },
+        i + 1,
+        `1939-09-0${i + 1}`,
+      ),
+    );
+    state.events = events;
+
+    const parsed = JSON.parse(buildUserPrompt(state, [])) as {
+      state: { recentEvents: Array<{ title: string; turn: number; date: string }> };
+    };
+
+    expect(parsed.state.recentEvents).toHaveLength(5);
+    // the last 5 of the 8 input events, in order
+    expect(parsed.state.recentEvents[0].title).toBe(events[3].title); // 'Event 4'
+    expect(parsed.state.recentEvents[4].title).toBe(events[7].title); // 'Event 8'
+    expect(parsed.state.recentEvents.map((e) => e.title)).toEqual([
+      events[3].title,
+      events[4].title,
+      events[5].title,
+      events[6].title,
+      events[7].title,
+    ]);
+  });
+
+  it('asks the model to keep its internal reasoning brief (concise-CoT constraint)', () => {
+    expect(buildSystemPrompt(preset)).toMatch(/reasoning brief|a few sentences/i);
+  });
 });
 
 describe('queueRoundItem', () => {

server/engine.ts

@@ -59,6 +59,7 @@ export function buildSystemPrompt(preset: Preset): string {
     'HARD CONSTRAINTS',
     '- Use only nation ids and ISO_A3 codes that exist in the provided state.',
     '- Prefer 1-4 events per turn; keep each text 1-3 sentences.',
+    '- Keep your internal reasoning brief (a few sentences) and go straight to the JSON result; do not over-deliberate or re-derive facts already present in the state.',
     '- Keep every stat value between 0 and 100.',
     '- Only change borders when war or a decisive political shift justifies it.',
     '- If a field is not relevant this turn, set it to an empty array.',
@@ -95,7 +96,7 @@ export function buildUserPrompt(state: GameState, items: RoundItem[]): string {
       nations: Object.fromEntries(
         Object.entries(state.nations).map(([id, n]) => [id, nationForPrompt(n)]),
       ),
-      recentEvents: state.events.slice(-10).map((e) => ({
+      recentEvents: state.events.slice(-5).map((e) => ({
         turn: e.turn,
         date: e.date,
         nation: e.nation,

server/index.ts

@@ -156,6 +156,17 @@ app.get('/api/games/:id/map', (req, res) => {
   res.json({ regions: buildRegionMap(game) });
 });
 
+// Delete a saved game entirely. Fast, non-LLM. 404 if it doesn't exist; on
+// success broadcast an SSE `error` to any other open tab watching it so it
+// returns home (see the `event: error` handling in src/lib/sse.ts).
+app.delete('/api/games/:id', (req, res) => {
+  const id = req.params.id;
+  const removed = db.delete(id);
+  if (!removed) return res.status(404).json({ error: 'game not found' });
+  broadcast(id, 'error', { message: 'game deleted' });
+  res.json({ deleted: true });
+});
+
 // Queue a free-text player action onto the pending round. No LLM call and no
 // turn advance — the round is only committed (in one turn) by "Jump forward".
 app.post('/api/games/:id/action', (req, res) => {

server/map.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import { buildRegionMap } from './map';
-import { nationColor } from '../shared/protocol';
+import { nationColor, regionOwner, type RegionMap } from '../shared/protocol';
 import type { GameState } from '../shared/types';
 
 const state: GameState = {
@@ -33,6 +33,9 @@ const state: GameState = {
   version: 1,
 };
 
+// The RegionMap built from the fixture: the authoritative ISO_A3 → owner source.
+const regions: RegionMap = buildRegionMap(state);
+
 describe('buildRegionMap', () => {
   it('maps each ISO_A3 region to its owner + that nation\'s stable color', () => {
     const m = buildRegionMap(state);
@@ -44,6 +47,67 @@ describe('buildRegionMap', () => {
   });
 });
 
+describe('regionOwner', () => {
+  it('resolves an owned region\'s ISO_A3 to its owner record', () => {
+    expect(regionOwner(regions, 'GBR')).toEqual({
+      color: nationColor('uk'),
+      owner: 'UK',
+      ownerId: 'uk',
+    });
+    expect(regionOwner(regions, 'DEU')).toEqual({
+      color: nationColor('de'),
+      owner: 'DE',
+      ownerId: 'de',
+    });
+  });
+
+  it('returns undefined for an unowned region (no RegionMap entry)', () => {
+    expect(regionOwner(regions, 'FRA')).toBeUndefined();
+    expect(regionOwner(regions, 'USA')).toBeUndefined();
+  });
+
+  it('returns undefined for an empty or missing code', () => {
+    expect(regionOwner(regions, '')).toBeUndefined();
+    expect(regionOwner(regions, null)).toBeUndefined();
+    expect(regionOwner(regions, undefined)).toBeUndefined();
+  });
+});
+
+/**
+ * #6 regression guard. The click/hover handlers resolve the owning nation from a
+ * map feature. MapLibre repacks a GeoJSON source's top-level `id` (the ISO_A3
+ * string) into a *numeric index* when it stores the source, so a feature the map
+ * hands back at interaction time has a number for `id` and the ISO_A3 only lives
+ * in `properties.regionId`. This test pins the exact data shape and proves the
+ * fix: resolution via `properties.regionId` works, while the pre-fix path that
+ * read `feature.id` does not.
+ */
+describe('#6 — owner must be resolved from properties.regionId, not the repacked feature.id', () => {
+  // The shape MapLibre returns for a source feature after setData(): `id` is a
+  // number (here 0, as observed in the live map), and the ISO_A3 is preserved
+  // only in properties (the client stamps it as `regionId`).
+  const repackedFeature = {
+    id: 0,
+    properties: { name: 'DE', regionId: 'DEU' },
+  };
+
+  it('resolves the owner from properties.regionId (the fix)', () => {
+    const code = typeof repackedFeature.properties.regionId === 'string' ? repackedFeature.properties.regionId : '';
+    expect(regionOwner(regions, code)).toEqual({
+      color: nationColor('de'),
+      owner: 'DE',
+      ownerId: 'de',
+    });
+  });
+
+  it('the old path (feature.id as a string key) does NOT resolve — the bug', () => {
+    // String(0) === '0' is not a valid ISO_A3 key, so the pre-fix lookup failed
+    // and the click popup reported "No owner" even for owned regions.
+    expect(regions[String(repackedFeature.id)]).toBeUndefined();
+    expect(regionOwner(regions, String(repackedFeature.id))).toBeUndefined();
+  });
+});
+
 describe('nationColor', () => {
   it('is deterministic per id and distinct across different ids', () => {
     expect(nationColor('uk')).toBe(nationColor('uk'));

shared/protocol.ts

@@ -56,6 +56,23 @@ export interface RegionOwner {
 }
 export type RegionMap = Record<string, RegionOwner>;
 
+/**
+ * Look up the owner record for a map region from the authoritative RegionMap by
+ * its ISO_A3 code. Returns `undefined` for an empty/missing code or an unowned
+ * region. Pure + shared: the client resolves a clicked or hovered map feature by
+ * first reading the feature's stable ISO_A3 code (stored in `properties.regionId`
+ * by the client when it repacks the source — see WorldMap) and then calling this.
+ *
+ * The code must NOT be taken from the feature's top-level `id`: MapLibre repacks
+ * a GeoJSON source's `id` (an ISO_A3 string) into a numeric index when it stores
+ * the source, so at click/hover time `feature.id` is a number, never the ISO_A3
+ * — resolving from it is exactly the "no owner" bug (#6).
+ */
+export function regionOwner(regions: RegionMap, isoA3: string | null | undefined): RegionOwner | undefined {
+  if (!isoA3) return undefined;
+  return regions[isoA3];
+}
+
 /** Server -> client Server-Sent Events payload (see server/index.ts /sse). */
 export type SseMessage =
   | { type: 'state'; state: GameState }
@@ -124,6 +141,11 @@ export interface GameSummary {
   date: string;
 }
 
+/** Response for deleting a saved game (see `DELETE /api/games/:id`). */
+export interface DeleteGameResponse {
+  deleted: boolean;
+}
+
 /**
  * Deterministic, stable per-nation color for the choropleth. Hashes the nation id
  * to a hue; sat/light tuned for the dark command-center theme. Pure + shared so

src/App.tsx

@@ -309,6 +309,12 @@ export default function App() {
   useSse(game?.id ?? null, {
     onState: applyState,
     onTurn: applyState,
+    // The game disappeared while this tab had it open — either deleted from
+    // another tab (the server broadcasts an SSE `error`) or a stale deep link to
+    // a missing game (the SSE connect emits `error`). Return this tab home.
+    onError: (msg) => {
+      if (/deleted|not found/i.test(msg)) latestRef.current?.goHome();
+    },
   });
 
   const play = useCallback(async (presetId: string) => {
@@ -465,6 +471,29 @@ export default function App() {
     setAdvisors([]);
   }, []);
 
+  // Delete a saved game. Removes it from the "Saved games" list, clears it if it
+  // was the remembered active game, and heads home if it's the one currently
+  // shown. The server also broadcasts an SSE `error` to any *other* open tab of
+  // this game, which the `useSse` `onError` handler above turns into a go-home.
+  const runDeleteGame = useCallback(
+    async (id: string) => {
+      try {
+        await api.deleteGame(id);
+      } catch (e) {
+        toastError(e);
+        return;
+      }
+      setSavedGames((prev) => prev.filter((g) => g.id !== id));
+      if (activeGameId === id) {
+        clearActiveGameId();
+        setActiveGameId(null);
+      }
+      if (game?.id === id) goHome();
+      toast.success('Game deleted');
+    },
+    [activeGameId, game, goHome],
+  );
+
   // Expose the latest game + handlers to the mount-once hashchange listener.
   latestRef.current = { game, goHome, loadGame };
 
@@ -509,6 +538,7 @@ export default function App() {
         savedGames={savedGames}
         activeGameId={activeGameId}
         onResume={resumeGame}
+        onDelete={runDeleteGame}
       />
     </>
   );

src/components/PresetPicker.tsx

@@ -1,7 +1,16 @@
-import { Play } from 'lucide-react';
+import { useState } from 'react';
+import { Play, Trash2 } from 'lucide-react';
 import { Badge } from './ui/badge';
 import { Button } from './ui/button';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from './ui/card';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from './ui/dialog';
 import type { PresetMeta } from '@shared/types';
 import type { GameSummary } from '@shared/protocol';
 
@@ -15,12 +24,14 @@ interface Props {
   activeGameId?: string | null;
   /** Resume a saved game by id (shared by the resume button and saved-games rows). */
   onResume?: (id: string) => void;
+  /** Delete a saved game by id (confirmed by a dialog in this component). */
+  onDelete?: (id: string) => void;
 }
 
 /**
  * Home screen: a grid of scenario cards (each with a Play button), a prominent
  * "Resume last game" affordance, and a "Saved games" section listing prior
- * games so the user can get back into one.
+ * games so the user can get back into one — or delete it.
  */
 export default function PresetPicker({
   presets,
@@ -29,8 +40,14 @@ export default function PresetPicker({
   savedGames = [],
   activeGameId,
   onResume,
+  onDelete,
 }: Props) {
   const activeGame = activeGameId ? savedGames.find((g) => g.id === activeGameId) : undefined;
+  // The game awaiting a delete confirmation (null = dialog closed).
+  const [confirmDeleteId, setConfirmDeleteId] = useState<string | null>(null);
+  const confirmDeleteTarget = confirmDeleteId
+    ? savedGames.find((g) => g.id === confirmDeleteId)
+    : undefined;
 
   return (
     <div className="mx-auto max-w-6xl px-6 py-10">
@@ -90,7 +107,7 @@ export default function PresetPicker({
         ))}
       </div>
 
-      {/* Saved games: get back into any prior game. */}
+      {/* Saved games: get back into any prior game (or delete it). */}
       {savedGames.length > 0 && (
         <section className="mt-12" data-testid="saved-games">
           <h2 className="mb-4 text-xl font-bold tracking-tight">Saved games</h2>
@@ -100,13 +117,28 @@ export default function PresetPicker({
                 key={g.id}
                 className="flex flex-col"
                 data-testid="saved-game"
+                data-game-id={g.id}
               >
                 <CardHeader>
                   <div className="flex items-start justify-between gap-2">
                     <CardTitle className="text-base">{g.presetTitle}</CardTitle>
-                    <Badge variant="secondary" className="shrink-0 text-xs">
-                      {g.date}
-                    </Badge>
+                    <div className="flex shrink-0 items-center gap-1">
+                      <Badge variant="secondary" className="text-xs">
+                        {g.date}
+                      </Badge>
+                      <Button
+                        variant="ghost"
+                        size="icon-sm"
+                        className="text-muted-foreground hover:text-destructive"
+                        data-testid="delete-game"
+                        aria-label={`Delete ${g.presetTitle}`}
+                        title="Delete this game"
+                        onClick={() => setConfirmDeleteId(g.id)}
+                        disabled={loading}
+                      >
+                        <Trash2 />
+                      </Button>
+                    </div>
                   </div>
                   <CardDescription className="text-sm">Turn {g.turn}</CardDescription>
                 </CardHeader>
@@ -125,6 +157,40 @@ export default function PresetPicker({
           </div>
         </section>
       )}
+
+      {/* Confirm before permanently deleting a saved game. */}
+      <Dialog open={confirmDeleteId !== null} onOpenChange={(o) => !o && setConfirmDeleteId(null)}>
+        <DialogContent className="max-w-sm" data-testid="delete-game-confirm-dialog">
+          <DialogHeader>
+            <DialogTitle>Delete this game?</DialogTitle>
+            <DialogDescription>
+              {confirmDeleteTarget
+                ? `"${confirmDeleteTarget.presetTitle}" (turn ${confirmDeleteTarget.turn}, ${confirmDeleteTarget.date}) will be permanently removed. This cannot be undone.`
+                : 'This game will be permanently removed.'}
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button
+              variant="outline"
+              data-testid="delete-game-cancel"
+              onClick={() => setConfirmDeleteId(null)}
+            >
+              Cancel
+            </Button>
+            <Button
+              variant="destructive"
+              data-testid="delete-game-confirm"
+              onClick={() => {
+                const id = confirmDeleteId;
+                setConfirmDeleteId(null);
+                if (id) onDelete?.(id);
+              }}
+            >
+              Delete
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
     </div>
   );
 }

src/components/WorldMap.tsx

@@ -8,7 +8,7 @@ import 'maplibre-gl/dist/maplibre-gl.css';
 // Point it at a Vite-emitted copy of the worker module so it loads in prod.
 import workerUrl from 'maplibre-gl/dist/maplibre-gl-worker.mjs?url';
 maplibregl.setWorkerUrl(workerUrl);
-import type { RegionMap, RegionOwner } from '@shared/protocol';
+import { regionOwner, type RegionMap, type RegionOwner } from '@shared/protocol';
 import type { Nation } from '@shared/types';
 import { cn } from '@/lib/utils';
 
@@ -61,7 +61,7 @@ const INLINE_STYLE: maplibregl.StyleSpecification = {
       type: 'raster',
       source: 'terrain',
       paint: {
-        'raster-opacity': 0.5,
+        'raster-opacity': 0.15,
         'raster-brightness-max': 0.8,
         'raster-fade-duration': 200,
       },
@@ -101,21 +101,36 @@ function cameraForPreset(presetId: string): { center: [number, number]; zoom: nu
  * carries its owner's stable fill color, a subtle stroke, and a flag for the
  * player's own regions (rendered as a brighter, thicker border by a dedicated
  * layer). Unknown owners fall back to a faint neutral fill — never an error.
+ *
+ * Crucially, the base GeoJSON feature's top-level `id` (the ISO_A3 code) is
+ * stamped into `properties.regionId`, and the owner's id into `properties.ownerId`.
+ * MapLibre repacks a GeoJSON source's top-level `id` into a numeric index when it
+ * stores it, so a later click/hover event exposes that number on
+ * `e.features[i].id` — the top-level `id` is *not* a reliable lookup key at
+ * interaction time (the root cause of #6). `properties`, however, survive into the
+ * rendered features, so the interaction handlers resolve the owning nation from
+ * `properties.regionId` via the RegionMap (see `regionOwner`).
  */
 function applyRegions(geo: FeatureCollection, regions: RegionMap, playerNationId: string): FeatureCollection {
   const out: FeatureCollection = JSON.parse(JSON.stringify(geo));
   for (const f of out.features) {
     f.properties = f.properties ?? {};
-    const r = f.id ? regions[f.id as string] : undefined;
+    // The base GeoJSON `id` is the ISO_A3 code; keep it in a property that
+    // survives into the features MapLibre hands back on click/hover.
+    const code = f.id == null ? '' : String(f.id);
+    f.properties.regionId = code;
+    const r = code ? regions[code] : undefined;
     if (r) {
       f.properties.fill = r.color;
       f.properties.owner = r.owner;
-      f.properties.stroke = 'rgba(255,255,255,0.10)';
+      f.properties.ownerId = r.ownerId;
+      f.properties.stroke = 'rgba(255,255,255,0.30)';
       f.properties.isPlayer = r.ownerId === playerNationId ? 1 : 0;
     } else {
       f.properties.fill = 'rgba(148,163,184,0.05)';
-      f.properties.stroke = 'rgba(255,255,255,0.06)';
+      f.properties.stroke = 'rgba(255,255,255,0.14)';
       f.properties.owner = '';
+      f.properties.ownerId = '';
       f.properties.isPlayer = 0;
     }
   }
@@ -150,35 +165,19 @@ function hoverHtml(countryName: string, region?: RegionOwner, nation?: Nation):
   </div>`;
 }
 
-/** Click popup: the full owning-nation profile with all four stats. */
-function clickHtml(countryName: string, region?: RegionOwner, nation?: Nation): string {
-  if (!region || !nation) {
-    return `<div class="hm-popup"><div class="hm-popup-title">${esc(countryName || 'Unclaimed')}</div><div class="hm-popup-sub">No owner</div></div>`;
-  }
-  const stats = [
-    statRow('Mil', nation.stats.military),
-    statRow('Eco', nation.stats.economy),
-    statRow('Stab', nation.stats.stability),
-    statRow('Pop', nation.stats.population),
-  ].join('');
-  const regions = nation.territory.length;
-  return `<div class="hm-popup">
-    <div class="hm-popup-title">${esc(countryName || region.owner)}</div>
-    <div class="hm-popup-owner hm-popup-owner-big"><span class="hm-chip" style="background:${region.color}"></span>${esc(region.owner)}</div>
-    <div class="hm-popup-sub">${regions} region${regions === 1 ? '' : 's'} · click focuses the dossier</div>
-    <div class="hm-stats">${stats}</div>
-  </div>`;
-}
-
 interface Props {
   regions: RegionMap;
   playerNationId: string;
-  /** All nations, for hover/click stats and color chips. */
+  /** All nations, for the hover tooltip's owner stats and color chips. */
   nations: Record<string, Nation>;
   /** The active scenario id, for a sensible initial camera. */
   presetId: string;
   className?: string;
-  /** Called when a region is clicked, so the dossier can focus its owner. */
+  /**
+   * Called with a region's owning-nation id when that region is clicked, so the
+   * dossier switches to that nation. Not called for unowned regions (the dossier
+   * keeps its current target). See the component doc for the full behavior.
+   */
   onFocusNation?: (id: string) => void;
 }
 
@@ -187,10 +186,18 @@ interface Props {
  * nation. Rendered as a fixed, full-viewport background layer (z-0) behind the
  * floating HUD windows: a dark-navy basemap with subtle terrain, per-nation
  * stable fills (the choropleth is the star), thin borders, a brighter/thicker
- * border for the player, hover + click popups with
- * owner + stats, a transient flash on territory changes, and a
- * per-scenario initial camera. Zoom and pan are driven directly by the user
- * (MapLibre wheel/trackpad + drag) — no floating control and no external API.
+ * border for the player, a hover tooltip (owner + key stats), a **click that
+ * switches the dossier to the region's owning nation** (no popup — see #7), a
+ * transient flash on territory changes, and a per-scenario initial camera.
+ *
+ * Ownership for a hovered/clicked region is resolved from the authoritative
+ * RegionMap by the feature's stable ISO_A3 code in `properties.regionId`
+ * (see `regionOwner` in @shared/protocol) — never from the feature's top-level
+ * `id`, which MapLibre repacks into a numeric index at interaction time (#6).
+ * Unowned regions (no RegionMap entry) simply do not change the dossier.
+ *
+ * Zoom and pan are driven directly by the user (MapLibre wheel/trackpad + drag)
+ * — no floating control and no external API.
  */
 export default function WorldMap({
   regions,
@@ -243,7 +250,6 @@ export default function WorldMap({
     (containerRef.current as unknown as { __map?: maplibregl.Map }).__map = map;
 
     const hoverPopup = new maplibregl.Popup({ closeButton: false, closeOnClick: false, offset: 10 });
-    const clickPopup = new maplibregl.Popup({ closeButton: true, closeOnClick: true, offset: 12 });
     let lastHoverId: string | null = null;
 
     const loadGeo = (): Promise<FeatureCollection> =>
@@ -300,24 +306,33 @@ export default function WorldMap({
     }
     flashApiRef.current = animateFlash;
 
+    // The region a hovered/clicked feature belongs to is identified by its stable
+    // ISO_A3 code, read from `properties.regionId` (stamped by `applyRegions`).
+    // We must NOT use the feature's top-level `id`: MapLibre repacks a GeoJSON
+    // source's `id` into a numeric index when it stores the source, so the value
+    // exposed on `e.features[i].id` at interaction time is a number, never the
+    // ISO_A3 — resolving the owner from it is the "no owner" bug (#6).
     const onHover = (e: maplibregl.MapLayerMouseEvent) => {
       const f = e.features?.[0];
       if (!f) return;
-      const id = f.id == null ? null : String(f.id);
-      if (id && id !== lastHoverId) {
-        lastHoverId = id;
+      const p = f.properties as { name?: string; regionId?: string };
+      const code = typeof p?.regionId === 'string' ? p.regionId : '';
+      if (code && code !== lastHoverId) {
+        lastHoverId = code;
         const geo = baseGeoRef.current;
-        const feat = geo?.features.find((x) => x.id != null && String(x.id) === id);
+        // The base GeoJSON feature's top-level `id` IS the ISO_A3, so match on
+        // that to recover the feature for the hover-highlight outline (the
+        // feature MapLibre hands us has a repacked numeric `id` we can't use).
+        const feat = geo?.features.find((x) => x.id != null && String(x.id) === code);
         (map.getSource(HOVER_SOURCE) as GeoSource | undefined)?.setData(
           feat ? { type: 'FeatureCollection', features: [JSON.parse(JSON.stringify(feat))] } : emptyFC(),
         );
       }
-      const p = f.properties as { name?: string };
-      const region = id ? regionsRef.current[id] : undefined;
+      const region = regionOwner(regionsRef.current, code);
       const nation = region ? nationsRef.current[region.ownerId] : undefined;
       hoverPopup
         .setLngLat(e.lngLat)
-        .setHTML(hoverHtml(p?.name ?? id ?? '', region, nation))
+        .setHTML(hoverHtml(p?.name ?? code, region, nation))
         .addTo(map);
       map.getCanvas().style.cursor = 'pointer';
     };
@@ -329,14 +344,17 @@ export default function WorldMap({
       map.getCanvas().style.cursor = '';
     };
 
+    // #7: a click does NOT open a popup — it switches the dossier to the region's
+    // owning nation. The owner is resolved from the stable ISO_A3 in
+    // `properties.regionId` via the RegionMap (never the repacked top-level
+    // `f.id`, #6). A region with no owner in the RegionMap (unowned territory)
+    // leaves the current dossier target unchanged — never a broken dossier.
     const onClick = (e: maplibregl.MapLayerMouseEvent) => {
       const f = e.features?.[0];
       if (!f) return;
-      const id = f.id == null ? null : String(f.id);
-      const p = f.properties as { name?: string };
-      const region = id ? regionsRef.current[id] : undefined;
-      const nation = region ? nationsRef.current[region.ownerId] : undefined;
-      clickPopup.setLngLat(e.lngLat).setHTML(clickHtml(p?.name ?? id ?? '', region, nation)).addTo(map);
+      const p = f.properties as { regionId?: string };
+      const code = typeof p?.regionId === 'string' ? p.regionId : '';
+      const region = regionOwner(regionsRef.current, code);
       if (region?.ownerId) onFocusNationRef.current?.(region.ownerId);
     };
 
@@ -393,7 +411,7 @@ export default function WorldMap({
           id: FILL_LAYER,
           type: 'fill',
           source: COUNTRIES_SOURCE,
-          paint: { 'fill-color': ['get', 'fill'], 'fill-opacity': 0.85 },
+          paint: { 'fill-color': ['get', 'fill'], 'fill-opacity': 1.0 },
         });
       }
       if (!map.getLayer(LINE_LAYER)) {
@@ -401,7 +419,7 @@ export default function WorldMap({
           id: LINE_LAYER,
           type: 'line',
           source: COUNTRIES_SOURCE,
-          paint: { 'line-color': ['get', 'stroke'], 'line-width': 0.7, 'line-opacity': 0.95 },
+          paint: { 'line-color': ['get', 'stroke'], 'line-width': 1.25, 'line-opacity': 0.95 },
         });
       }
       // NOTE: layers are added in bottom→top order (each appends on top). The

src/lib/api.ts

@@ -7,6 +7,7 @@ import type {
   AddDiplomacyResponse,
   AdvisorResponse,
   CreateGameResponse,
+  DeleteGameResponse,
   GameSummary,
   RemoveQueueItemResponse,
   TurnResponse,
@@ -33,6 +34,9 @@ export const api = {
       body: JSON.stringify({ presetId, playerNationId }),
     }),
   getGame: (id: string) => req<{ game: GameState }>(`/api/games/${id}`),
+  // Delete a saved game entirely. Fast, non-LLM. Returns { deleted: true }.
+  deleteGame: (id: string) =>
+    req<DeleteGameResponse>(`/api/games/${id}`, { method: 'DELETE' }),
   // Every saved game as a lightweight summary, newest-updated first (for the
   // home screen's "Saved games" section / resume affordances).
   listGames: () => req<{ games: GameSummary[] }>('/api/games'),

src/lib/sse.ts

@@ -5,6 +5,12 @@ import type { TurnResult } from '@shared/protocol';
 interface SseHandlers {
   onState?: (state: GameState) => void;
   onTurn?: (state: GameState, result: TurnResult) => void;
+  /**
+   * Fired for a server-sent NAMED `event: error` (a MessageEvent with a JSON
+   * body `{ message }`) — e.g. the game was deleted or no longer exists. Pure
+   * connection errors (no data) are ignored and EventSource auto-reconnects.
+   */
+  onError?: (message: string) => void;
 }
 
 /**
@@ -37,8 +43,19 @@ export function useSse(id: string | null, handlers: SseHandlers): void {
         /* ignore malformed */
       }
     };
+    const onError = (e: Event) => {
+      if (e instanceof MessageEvent && e.data) {
+        try {
+          const d = JSON.parse(e.data) as { message?: string };
+          if (d.message) handlersRef.current.onError?.(d.message);
+        } catch {
+          /* ignore malformed */
+        }
+      }
+    };
     es.addEventListener('state', onState);
     es.addEventListener('turn', onTurn);
+    es.addEventListener('error', onError);
     return () => es.close();
   }, [id]);
 }

tsconfig.json

@@ -20,5 +20,5 @@
       "@/*": ["./src/*"]
     }
   },
-  "include": ["src", "server", "shared", "e2e", "vite.config.ts"]
+  "include": ["src", "server", "shared", "e2e", "scripts", "vite.config.ts"]
 }

vitest.config.ts

@@ -13,7 +13,7 @@ export default defineConfig({
   },
   test: {
     environment: 'node',
-    include: ['server/**/*.test.ts'],
+    include: ['server/**/*.test.ts', 'scripts/**/*.test.ts'],
     testTimeout: 20000,
     hookTimeout: 20000,
   },